Originally Posted by
PHXflier
DL sometimes has very significant award sales. They are short, only a couple of days, and for specific time periods, but they can save you a significant number of miles. Being able to redeposit miles for free (DM), I usually book 300-330 days out and then improve on the number of miles to be used when attractive sales come along. I typically am able to get 2-3 cents per mile this way, and am satisfied with that.
The recent 98K Delta One RT to Europe including suites offered up to 10 cents per mile (against what was probably a full fare on some routes)
But this sale might happen 2x annually max, unfortunately